<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>cpstmid</title>
    <link rel="stylesheet" type="text/css" href="csound.css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
    <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
    <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" />
    <link rel="prev" href="cpspch.html" title="cpspch" />
    <link rel="next" href="cpstun.html" title="cpstun" />
  </head>
  <body>
    <div class="navheader">
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">cpstmid</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="cpspch.html">Prev</a> </td>
          <th width="60%" align="center">Orchestra Opcodes and Operators</th>
          <td width="20%" align="right"> <a accesskey="n" href="cpstun.html">Next</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="refentry">
      <a id="cpstmid"></a>
      <div class="titlepage"></div>
      <a id="IndexCpstmid" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">cpstmid</span>
        </h2>
        <p>cpstmid — 
      Get a MIDI note number (allows customized micro-tuning scales).
          </p>
      </div>
      <div class="refsect1">
        <a id="idp96628288"></a>
        <h2>Description</h2>
        <p>
      This unit is similar to <a class="link" href="cpsmidi.html" title="cpsmidi"><em class="citetitle">cpsmidi</em></a>, but allows fully customized micro-tuning scales.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp96630544"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">icps <span class="command"><strong>cpstmid</strong></span> ifn</pre>
      </div>
      <div class="refsect1">
        <a id="idp96632784"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>ifn</em></span> -- function table containing the parameters (<span class="emphasis"><em>numgrades</em></span>, <span class="emphasis"><em>interval</em></span>, <span class="emphasis"><em>basefreq</em></span>, <span class="emphasis"><em>basekeymidi</em></span>) and the tuning ratios.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp96636192"></a>
        <h2>Performance</h2>
        <p>
       Init-rate only
    </p>
        <p>
      <span class="emphasis"><em>cpsmid</em></span> requires five parameters, the first, <span class="emphasis"><em>ifn</em></span>, is the function table number of the tuning ratios, and the other parameters must be stored in the function table itself. The function table <span class="emphasis"><em>ifn</em></span> should be generated by <a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>, with normalization inhibited. The first four values stored in this function are:
      </p>
        <div class="orderedlist">
          <ol class="orderedlist" type="1">
            <li class="listitem">
              <p><span class="emphasis"><em>numgrades</em></span> -- the number of grades of the micro-tuning scale</p>
            </li>
            <li class="listitem">
              <p><span class="emphasis"><em>interval</em></span> -- the frequency range covered before repeating the grade ratios, for example 2 for one octave, 1.5 for a fifth etc.</p>
            </li>
            <li class="listitem">
              <p><span class="emphasis"><em>basefreq</em></span> -- the base frequency of the scale in Hz</p>
            </li>
            <li class="listitem">
              <p><span class="emphasis"><em>basekeymidi</em></span> -- the MIDI note number to which <span class="emphasis"><em>basefreq</em></span> is assigned unmodified</p>
            </li>
          </ol>
        </div>
        <p>
    </p>
        <p>
      After these four values, the user can begin to insert the tuning ratios. For example, for a standard 12 note scale with the base frequency of 261 Hz assigned to the key number 60, the corresponding f-statement in the score to generate the table should be:
      </p>
        <div class="literallayout">
          <p><br />
  ;          numgrades interval  basefreq basekeymidi tuning ratios (equal temp)   <br />
  f1 0 64 -2   12       2        261        60         1  1.059463094359  1.122462048309  1.189207115003 ..etc...  <br />
      </p>
        </div>
        <p>
    </p>
        <p>
      Another example with a 24 note scale with a base frequency of 440 assigned to the key number 48, and a repetition interval of 1.5:
      </p>
        <div class="literallayout">
          <p><br />
  ;           numgrades interval  basefreq basekeymidi tuning-ratios (equal temp)   <br />
  f1 0 64 -2   24        1.5      440        48         1   1.01  1.02  1.03   ..etc...  <br />
      </p>
        </div>
        <p>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp96649776"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the cpstmid opcode. It uses the file <a class="ulink" href="examples/cpstmid.csd" target="_top"><em class="citetitle">cpstmid.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp96651552"></a>
          <p class="title">
            <strong>Example 152. Example of the cpstmid opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac     -M0  <span class="comment">;;;RT audio I/O with MIDI in</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cpstmid.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>
<span class="comment">; after an example from Kevin Conder</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1

<span class="comment">; Table #1, a normal 12-tone equal temperament scale.</span>
<span class="comment">; numgrades = 12 (twelve tones)</span>
<span class="comment">; interval = 2 (one octave)</span>
<span class="comment">; basefreq = 261.659 (Middle C)</span>
<span class="comment">; basekeymidi = 60 (Middle C)</span>
gitemp <span class="ohdr">ftgen</span> 1, 0, 64, <span class="op">-</span>2, 12, 2, 261.659, 60, 1.00, \
             1.059, 1.122, 1.189, 1.260, 1.335, 1.414, \
             1.498, 1.588, 1.682, 1.782, 1.888, 2.000

<span class="oblock">instr</span> 1

ifn <span class="op">=</span> 1
icps	<span class="opc">cpstmid</span> ifn
	<span class="opc">print</span> icps
asig	<span class="opc">oscil</span> 0.6, icps, 2
	<span class="opc">outs</span>  asig, asig

<span class="oblock">endin</span>


<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="stamnt">f</span> 0 20
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 2 0 16384 10 1

<span class="stamnt">e</span>

<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />
    </p>
      </div>
      <div class="refsect1">
        <a id="idp96655872"></a>
        <h2>See Also</h2>
        <p>
      <a class="link" href="cpsmidi.html" title="cpsmidi"><em class="citetitle">cpsmidi</em></a>,
      <a class="link" href="GEN02.html" title="GEN02"><em class="citetitle">GEN02</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp96658944"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Gabriel Maldonado</td>
          </tr>
          <tr>
            <td>Italy</td>
          </tr>
          <tr>
            <td>1998</td>
          </tr>
        </table>
        <p>
    </p>
        <p>New in Csound version 3.492</p>
      </div>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="cpspch.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="OpcodesTop.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="cpstun.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">cpspch </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> cpstun</td>
        </tr>
      </table>
    </div>
  </body>
</html>
